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Effects of the film thickness on optical constants of transparent CdS thin films deposited by chemical bath deposition

F. YAKUPHANOGLU1,* , C. VİSWANATHAN2, P. PERANANTHAM2, D. SOUNDARRAJAN2

Affiliation

  1. Physics Department, Faculty of Arts and Science, Firat University, 23119 Elazig-Turkey
  2. Reseach Scholar, Department of Physics, Bharathiar University, Coimbatore-641 046 India

Abstract

The optical constants and band gaps of the CdS thin films deposited by chemical bath have been calculated in the spectral wavelength range 400–1000 nm from the transmittance and reflectance measurements of normally-incident light. The CdS thin films exhibit good transparent behavior due to high transmittance values. The optical band gaps of the films were respectively found to be 2.34, 2. 41 and 2.46 eV for 100, 125 and 152 nm thicknesses. The increase in film thickness leads to an increase in optical band gap of the films. The refractive index values of the thin films changed significantly with film thickness. The dielectric constant of the films was analyzed using Standard Drude model. The optical carrier concentration and mobility values for the CdS thin films were determined and the obtained values changed with film thickness. It is shown that the film thickness modifies the optical constants and band gaps of the CdS films..

Keywords

Optical constants, Optical band gap, CdS thin films.

Submitted at: June 14, 2009
Accepted at: July 23, 2009

Citation

F. YAKUPHANOGLU, C. VİSWANATHAN, P. PERANANTHAM, D. SOUNDARRAJAN, Effects of the film thickness on optical constants of transparent CdS thin films deposited by chemical bath deposition, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 7, pp. 945-949 (2009)